“Yes, it's hard to write. But it's harder not to.”
As quoted in 'Writing with Authors Kids Love : Writing Exercises by Authors of Children's Literature (1998) by Kathryn L. Johnson, p. 2
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Carl Van Doren 14
American biographer 1885–1950Related quotes

“When you are happy it is harder to write”
songs
Gayle King XM satellite radio program (October 23, 2006)
2007, 2008

“It's harder to write in the third person but the advantage is you move around better.”

“She thought a writer should work harder writing a book than she did reading it.”
Source: The Marriage Plot

Letter to A.S. Suvorin (May 4, 1889)
Letters

“Writing is thinking and thinking is hard work.”

“Easy reading is damn hard writing.”
Also attributed to Ernest Hemingway and others; the earliest definite occurrence of this yet found in research for Wikiquote is by Maya Angelou, who stated it in Conversations With Maya Angelou (1989) edited by Jeffrey M. Elliot:
I think it's Alexander Pope who says, "Easy writing is damn hard reading," and vice versa, easy reading is damn hard writing
The statement she referred to is most probably:
You write with ease, to show your breeding,
But easy writing's curst hard reading
Clio's Protest, or the Picture Varnished (written 1771, published 1819) by Richard Brinsley Sheridan
Disputed

“Writing is easy. It's just the typing that's hard.”
Miles Sparks, Prologue, p. 3
2000s, Three Weeks with My Brother (2004)

“Easy writing makes hard reading.”
As quoted in Paris Was Our Mistress (1947) by Samuel Putnam, p. 128